This free service doesn’t use up any of your iCloud space allowance, and can send attachments of up to 5 GB in size. Here’s how to use it on the Web, and in the Mail app.
attachment
When I opened an attachment in Mail, the content was that from an earlier attachment. How come?
Much of the content of messages I receive in Mail is missing, and attachments seem muddled. What is wrong?
Whenever my friend attaches a PDF to a message in Mail, it opens and gets embedded in the message, rather than being attached as a file. How can he change that behaviour?
The Eclectic Light Company 